How Many People Are Named Sinead?
An estimated 1,286 people in the United States have the first name Sinead. It is almost exclusively a female name. The average bearer is 29 years old, and Sinead peaked in popularity in 1990 with 160 births that year.
Below you will find a full statistical profile of Sinead as a first name in the United States, including gender data, a year-by-year popularity timeline going back to 1880, a decade breakdown, and state-by-state birth registrations. You can also check how many people share the full name Sinead paired with any surname.
Estimated Living Americans
1,286
About 1 in 266,527 people in the U.S.
Rarity
Rare
Predicted Gender
Female
100.0% confidence
Average Age
29
years old
Peak Year
1990
160 births
Total Registered
1,329
since 1880
Gender Distribution for Sinead
Sinead is almost exclusively a female name. Out of 1,329 total births registered, 100.0% were female.
Sinead as a female name
Ranked #8,331 in 2024
13 female births in 2024
Peak: 1990 (160 births)
Sinead: Popularity Over Time
SSA records for Sinead span from the 1970s to the 2020s, covering 6 decades of naming data. The most popular decade for this name was the 1990s, when 627 babies were registered. Sinead has declined significantly from its peak in the 1990s. Recent registrations are a fraction of what they were at the name's height.
Sinead by Decade
How has Sinead tracked across different eras? The table below groups all SSA birth registrations into 10-year periods, with separate male and female counts. The colored bar shows each decade's share relative to the peak.
Sinead by State
Birth registrations for Sinead span all 11 states and territories in the SSA database. The highest counts are in New York, California, Massachusetts. The lowest are in Ohio, Michigan, Arizona. On average, about 51 Sineads were registered per state.
Sinead + Last Name Combinations
How many people share a full name with Sinead as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Sinead
Other first names starting with S with a similar number of bearers.
Sinead: Questions and Answers
How many people in the U.S. are named Sinead?
We estimate approximately 1,286 people named Sinead are alive in the United States today. This is based on SSA birth records from 1880 to 2024, adjusted for mortality using CDC life tables. About 1 in 266,527 Americans share this first name.
Is Sinead a common name?
Sinead is classified as "Rare" and is more popular than 91.6% of all first names in the SSA database. A total of 1,329 births have been registered with this name since 1880.
When was Sinead most popular?
Sinead reached peak popularity in 1990, when 160 babies were given this name. The average age of a living person named Sinead is approximately 29 years old, reflecting when the name was most commonly given.
Is Sinead a female name?
Sinead is predominantly female. 100.0% of people with this name are female. See the gender breakdown above for full details.
How many Sinead Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Sinead Smith, Sinead Johnson, Sinead Williams. You can also search any combination on our homepage.
Where does this data come from?
Our estimates use Social Security Administration birth records (1880 to 2024), adjusted for survival using CDC 2023 life tables broken down by sex. The U.S. population figure (342,754,338) is from the Census Bureau's July 2025 estimate. Full methodology.
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